Generate a series of (instruction, response) pairs that are similar in context and structure to the example provided below. Each pair should consist of a concise instruction followed by an appropriate, detailed response. The instruction should pose a clear task or question, while the response should provide a comprehensive answer or solution that could be understood by someone with a basic understanding of the subject.

Example pair: 
Instruction: Summarize the text provided below and use this article to answer the question, "Do poppy seeds affect drug tests?"

Do poppy seeds affect drug tests?
Poppy seeds don’t have nearly enough opiates to intoxicate you. But because drug tests are exquisitely sensitive, consuming certain poppy seed food products can lead to positive urine drug test results for opiates – specifically for morphine, codeine or both.

Under most circumstances, opiate concentrations in the urine are too low to produce a positive test result. But certain food products – and it’s generally impossible to know which ones, because opiate content does not appear on food labels – contain enough opiates to produce positive test results. Moreover, because of overlap in opiate concentrations and morphine-to-codeine ratios, it can sometimes be challenging to distinguish test results that are due to the consumption of poppy seeds from those that are due to the use of opiate drugs.

This is not a problem with most workplace drug testing. Test results are reviewed by a specially trained physician called a medical review officer. Unless the physician finds evidence of unauthorized opiate use, such as needle marks or signs of opiate intoxication or withdrawal, even relatively high concentrations of opiates in the urine that produce positive test results are generally ruled to be negative.

It turns out, though, that drug testing in the military is different, and poppy seeds pose potential problems. One such problem, as highlighted in recent news reports, concerns service members who test positive for codeine and assert a “poppy seed defense.” They are still regarded as having taken codeine, sometimes with serious consequences, such as a disciplinary action or discharge from the service.
Response: Drug tests are extremely sensitive and consuming certain poppy seed foods can actually lead to positive urine drug tests. Other foods can set off a drug test, but it's nearly impossible to tell which ones will. 

During most workplace drug tests, a trained physician will list the results as negative unless they see other evidence of opiate use such as needle marks, intoxication, or very high concentrations of opiates in the system. The military on the other hand may take serious disciplinary action if they find any opioids in a drug test, even if the culprit is only poppy seed foods. 

To answer the question, Yes, poppy seeds can set off a drug test, but it generally does not result in a positive test unless they are being ultra strict.

Your task is to generate more pairs that maintain this level of clarity and detail. The topic is Summarization. Write a long text of instruction by yourself, then summarize the given instruction in a response. Ensure that the responses are informative and accurate, suitable for an educational context. 

Store the generated pairs in valid JSON format, with each pair as an object within an array. Each object should have two key-value pairs: "instruction" and "response". For instance: 

{"contents": [{"instruction": "text", "response": "text"}, {"instruction": "text", "response": "text"}, ...]} 

Remember to maintain consistency in the format and ensure the generated pairs are diverse and cover a broad range of subjects. You must return the response in the asked format and you must not add any additional text in your response.

Describe the process of natural selection and its significance in evolution.
user
Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring. This concept, introduced by Charles Darwin, explains how advantageous traits become more common in a population over generations. Through natural selection, species evolve and diversify, leading to the adaptation of organisms to their specific ecological niches and environments.
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